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Full Discussion: Lost CPU CORES
Operating Systems Linux Red Hat Lost CPU CORES Post 302554916 by fpmurphy on Tuesday 13th of September 2011 10:46:39 AM
Old 09-13-2011
Quote:
Originally Posted by Neo
OK, run this command:
Code:
zgrep SMP /proc/config.gz

On Fedora and downstream, the file you probably want is /boot/config-<name of your kernel>. Also CONFIG_SMP is Y by default - at least on AMD64 (x86_64) platforms. For example, I am using 2.6.40 on a F15 X32 development system, so the name of the configuration file is config.2.6.40.4-5.fc15.x32. (x32 is not a typo, it is a new emerging psABI)

If the OP installs and runs cpuid, we will have a much better idea of what the actual cpus think they are. I suspect that cpuid will return the expected values but I think we should eliminate this possibility or that some cores have been disabled by the BIOS. BTW, There was an interesting discussion on FreeBSD back in 2010 re E5530s and missing cores. Search for "FreeBSD, E5530 cpuid acpidump." Turns out that the missing cores were disabled by a BIOS setting.
 

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BOOT.CONFIG(5)						      BSD File Formats Manual						    BOOT.CONFIG(5)

NAME
boot.config -- Configuration file for the boot blocks DESCRIPTION
The boot.config file contains options for the FreeBSD boot block code. When the FreeBSD boot loader runs, it searches the ``a'' slice of the boot partition for a boot.config file (as a result, slices which are missing an ``a'' partition require user intervention during the boot process). If the boot.config file is found, its contents are used as the default configuration options for the boot block code and are echoed to the system console. A valid format of this file is to put BIOS drive number, a controller type, a unit number, a partition, a kernel file name, and any other valid boot(8) option on a single line, as it is done at the ``boot:'' prompt. The options related to the boot image selection described below and all the other options available for boot.config are documented in detail in the boot(8) manual page. FILES
/boot.config parameters for the boot blocks (optional) EXAMPLES
The command: # echo "-P" > /boot.config will activate the serial console of FreeBSD. The command: # echo "1:ad(1,a)/boot/loader" > /boot.config will instruct the second stage of boot(8) on the first disk to boot with the third boot(8) stage from the second disk. The command: # echo "1:ad(1,a)/boot/loader -P" > /boot.config will do both of the above. SEE ALSO
boot(8), loader(8) AUTHORS
This manual page was written by Daniel Gerzo <danger@FreeBSD.org>. BSD
May 13, 2007 BSD
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